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I think you’re correct though. My guess is that it prioritized these searches because it has an exact match of singular Fs in them, like what they’ve typed. All male four/fivesome both haves Fs, and would probably be included if it includes more results, but they’re scored lower since there’s no lone Fs.
I love computer magic. They do exactly what we tell them to. The problem is sometimes we’re not sure what it is we told them to do.